A two-stage pressure regulating and flow regulating device

Abstract

This utility model relates to the field of airflow control technology, specifically a two-stage pressure and flow regulating device. It integrates two pressure regulating zones within a single valve body to meet pressure and flow regulation requirements, simplifying installation and reducing the risk of leakage. The device includes a valve seat, on which are mounted an air inlet connector, a main shut-off valve, a pilot valve, a primary pressure regulating valve, and a secondary pressure regulating valve. A primary pressure regulating zone is located at the connection between the primary pressure regulating valve and the valve seat, and a secondary pressure regulating zone is located at the connection between the secondary pressure regulating valve and the valve seat. The valve seat contains a first channel connecting the air inlet connector and the inlet of the main shut-off valve, a second channel connecting the outlet of the main shut-off valve and the primary pressure regulating zone, and a third channel connecting the primary and secondary pressure regulating zones. The main shut-off valve contains a pilot air channel penetrating its lower and upper ends. The valve seat contains a fourth channel connecting the upper end of the main shut-off valve and the inlet of the pilot valve, and a fifth channel connecting the outlet of the pilot valve and the second channel. An air outlet connector is mounted on the secondary pressure regulating valve.

Description

Technical Field

[0001] This utility model relates to the field of airflow control technology, specifically a two-stage pressure and flow regulation device. Background Technology

[0002] Currently, most high-pressure regulating valves are diaphragm-type structures, which cannot achieve zero or low pressure differential opening. The diaphragm sealing performance is unstable and prone to leakage, which is especially dangerous when the medium used is flammable and explosive gas. In addition, the outlet flow rate is small, and a single regulating valve cannot meet the requirements. Two or more products need to be installed to meet the high flow rate application of the client, which makes the product installation complicated. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a two-stage pressure and flow regulating device, which integrates two pressure regulating zones in one valve body to meet the requirements of pressure and flow regulation, simplify installation, and reduce the risk of leakage.

[0004] The technical solution is as follows: A two-stage pressure and flow regulating device includes a valve seat, characterized in that an air inlet connector, a main shut-off valve, a pilot valve, a first-stage pressure regulating valve, and a second-stage pressure regulating valve are installed on the valve seat. A first-stage pressure regulating zone is provided at the connection between the first-stage pressure regulating valve and the valve seat, and a second-stage pressure regulating zone is provided at the connection between the second-stage pressure regulating valve and the valve seat. The valve seat is provided with a first channel connecting the air inlet connector and the inlet of the main shut-off valve, a second channel connecting the outlet of the main shut-off valve and the first-stage pressure regulating zone, and a third channel connecting the first-stage pressure regulating zone and the second-stage pressure regulating zone. A pilot air channel penetrating the lower and upper ends of the main shut-off valve is provided inside the main shut-off valve. The valve seat is provided with a fourth channel connecting the upper end of the main shut-off valve and the inlet of the pilot valve, and a fifth channel connecting the outlet of the pilot valve and the second channel. An air outlet connector is installed on the second-stage pressure regulating valve.

[0005] A further feature is that the first-stage pressure regulating valve includes a first valve body, the first valve body having a first cavity, the first cavity being equipped with a first-stage pressure balancing piston and a first-stage pressure balancing spring, the first-stage pressure balancing piston having a first-stage pressure regulating channel, the first-stage pressure balancing piston dividing the first cavity into an upper first cavity and a lower first cavity, the upper first cavity being connected to the external atmosphere, one end of the first-stage pressure balancing piston having an air inlet connecting the first-stage pressure regulating area and the first-stage pressure regulating channel, and the other end being connected to the lower first cavity;

[0006] A pressure relief valve is installed in the first lower cavity;

[0007] The secondary pressure regulating valve includes a second valve body, which has a second cavity. The second cavity has a secondary pressure balancing piston and a secondary pressure balancing spring. The secondary pressure balancing piston has a secondary pressure regulating channel. The secondary pressure balancing piston divides the second cavity into an upper second cavity and a lower second cavity. The upper second cavity is connected to the outside atmosphere. One end of the secondary pressure regulating channel is connected to the secondary pressure regulating zone, and the other end is connected to the lower second cavity. The air outlet connector is installed in the lower second cavity.

[0008] A sealing gasket is provided at the secondary pressure regulating zone;

[0009] A filter is installed in the first channel and a filter plug is provided;

[0010] The valve seat has a water-heat channel.

[0011] By adopting this utility model, the pilot valve and two pressure regulating valves are integrated on one valve seat, which can be opened with zero pressure difference and low pressure difference, reducing leakage points. The required flow and pressure can be obtained through two-stage pressure regulation. The structure is simple and the installation is simplified. Attached Figure Description

[0012] Figure 1 This is the main structural view of the utility model;

[0013] Figure 2 This is a top view of the structure of the utility model;

[0014] Figure 3 yes Figure 2 Sectional view of AA;

[0015] Figure 4 yes Figure 2 BB section view;

[0016] Figure 5 yes Figure 1 CC section view;

[0017] Figure 6 This is a schematic diagram of the first-stage pressure balancing piston in a first-stage pressure regulating valve;

[0018] Figure 7 This is a schematic diagram of the bushing structure;

[0019] Figure 8 This diagram illustrates the direction of gas flow when the pilot valve is open. Figure 1 ;

[0020] Figure 9 This diagram illustrates the direction of gas flow when the pilot valve is open. Figure 2 . Detailed Implementation

[0021] See Figures 1-6 As shown, a two-stage pressure and flow regulating device includes a valve seat 1, on which an air inlet connector 2, a main shut-off valve 3, a pilot valve 4, a primary pressure regulating valve 5, and a secondary pressure regulating valve 6 are installed. A primary pressure regulating zone 7 is provided at the connection between the primary pressure regulating valve 5 and the valve seat 1, and a secondary pressure regulating zone 8 is provided at the connection between the secondary pressure regulating valve 6 and the valve seat 1. The valve seat is provided with a first channel 9 connecting the air inlet connector 2 and the inlet of the main shut-off valve 3, a second channel 10 connecting the outlet of the main shut-off valve 3 and the primary pressure regulating zone 5, and a third channel 11 connecting the primary pressure regulating zone 5 and the secondary pressure regulating zone 6. A pilot air channel 12 penetrating the lower and upper ends of the main shut-off valve 3 is provided in the main shut-off valve 3. A fourth channel 13 connecting the upper end of the main shut-off valve 3 and the inlet of the pilot valve 4, and a fifth channel 14 connecting the outlet of the pilot valve 4 and the second channel 10 are provided in the valve seat 1. An air outlet connector 15 is installed on the secondary pressure regulating valve 6.

[0022] The main shut-off valve 3 contains a valve cover 3-1, a piston assembly 3-2, and a main return spring 3-3. The first valve port 3-4, which matches the piston assembly, is integrated into the valve seat 1. The pilot valve 4 includes a magnetically conductive assembly consisting of a coil 4-1 and a valve stem assembly 4-2, a valve core assembly 4-5, and a pilot return spring 4-3. The second valve port 4-4, which cooperates with the valve core assembly 4-5, is integrated into the valve seat 1.

[0023] The primary pressure regulating valve 5 includes a first valve body 5-1, within which a first cavity is formed. A primary pressure balancing piston 5-2 and a primary pressure balancing spring 5-3 are installed in the first cavity. A primary pressure regulating channel 5-4 is provided within the primary pressure balancing piston 5-2. The primary pressure balancing piston 5-2 divides the first cavity into an upper first cavity 5-5 and a lower first cavity 5-6. The upper first cavity 5-5 is connected to the external atmosphere. One end of the primary pressure balancing piston 5-2 has a connection between a primary pressure regulating zone 7 and the primary pressure regulating channel 5-6. -4 has an air inlet 5-7, and the other end is connected to the first lower cavity 5-6. The air inlet 5-7 is sealed by a gasket 5-8, which is directly opposite the second channel 10. A pressure relief valve 16 is installed at the first lower cavity 5-6. The gas medium enters from the air inlet connector 2, passes through the first channel 9, and enters the main shut-off valve 3. At this time, the main shut-off valve 3 is in the closed state. The gas medium first passes through the pilot air channel 12 and the fourth channel 13 to enter the pilot valve 4. The pilot valve 4 opens, and then passes through the fifth channel 14 and the second channel 10 to reach the first-stage pressure regulating zone, such as... Figure 8 and Figure 9As shown by the red line; the pressure in the upper and lower chambers of the main shut-off valve 3 is unbalanced, with the pressure in the lower chamber being greater than that in the upper chamber. The main shut-off valve 3 opens, allowing the gas medium to pass smoothly through the first valve port 3-4, through the second channel 10 to the first-stage pressure regulating zone 7, and then through the inlet port 5-7 into the first-stage pressure regulating channel 5-4, finally reaching the first lower chamber 5-6. The pressure in the first lower chamber 5-6 increases, and this pressure, combined with the atmospheric pressure in the first upper chamber 5-5, causes the first-stage pressure balancing piston 5-2 to move, passing through the pad 5-8 on its top and... The distance of the second channel 10 is used to regulate the pressure of the gas medium, reducing the high pressure to medium pressure; when the first lower chamber 5-6 reaches a certain upper limit value, the pressure relief valve 16 opens, reducing the first-stage outlet pressure, thereby controlling the flow and pressure, and protecting the second-stage pressure regulating valve and downstream components. The pressure relief valve 16 is equipped with a pressure relief piston assembly 16-1, a pressure relief reset spring 16-2, a pressure relief connector 16-3, and a pressure relief valve port 16-4. The pressure relief valve port 16-4 is integrated on the valve cover 5-9 of the first-stage pressure regulating valve 5.

[0024] The secondary pressure regulating valve 6 includes a second valve body 6-1, within which a second cavity is formed. The second cavity contains a secondary pressure balancing piston 6-2 and a secondary pressure balancing spring 6-3. A secondary pressure regulating channel 6-4 is provided within the secondary pressure balancing piston 6-2, which divides the second cavity into an upper secondary cavity 6-5 and a lower secondary cavity 6-6. The upper secondary cavity 6-5 is connected to the external atmosphere. One end of the secondary pressure regulating channel 6-4 is connected to the secondary pressure regulating zone 8, and the other end is connected to the lower secondary cavity 6-6. An air outlet connector 15 is installed on the... The second lower chamber 6-6; the principle of the second-stage pressure regulating valve 6 is similar to that of the first-stage pressure regulating valve 5. After being regulated by the first-stage pressure regulating valve 5, it enters the second-stage pressure regulating zone 8. The gas medium directly enters the second-stage pressure regulating channel 6-4, and part of it enters the second lower chamber 6-6. The atmospheric pressure in the second upper chamber 6-5 causes the second-stage pressure balancing piston 6-2 to move. A sealing gasket 6-7 is provided at the second-stage pressure regulating zone 8. The pressure is regulated by the change in the distance between the end of the second-stage pressure regulating channel 6-4 and the sealing gasket 6-7, so that the medium pressure is regulated to low pressure, and finally discharged from the gas outlet 15.

[0025] To ensure the smooth entry of the gas medium into the first lower chamber 5-6 and the second lower chamber 6-6, the lower parts of both the first-stage pressure balancing piston 5-2 and the second-stage pressure balancing piston 6-2 are equipped with... Figure 7 The bushing 21 shown has a gas flow gap on its side.

[0026] The first channel is equipped with a filter 17 and a filter plug 18 at 9 locations to achieve a filtering effect and prevent dust particles from causing blockage. If the air cleanliness of the applicable environment is very high, the filter 17 may not be necessary.

[0027] Because the intake pressure of the two-stage pressure regulation is too high, the gas medium will absorb a lot of heat when it is reduced from high pressure to low pressure, which will cause the temperature of internal parts such as valve seat 1 to drop. Therefore, valve seat 1 also contains a U-shaped water-heating channel 22 for heating the valve seat. When the heating liquid medium flows from water connector 19 through water-heating channel 22 to water outlet connector 20, it will circulate and provide auxiliary heating for parts such as valve seat 1.

Claims

1. A two-stage pressure and flow regulating device, comprising a valve seat, characterized in that, The valve seat is equipped with an air inlet connector, a main shut-off valve, a pilot valve, a primary pressure regulating valve, and a secondary pressure regulating valve. A primary pressure regulating zone is provided at the connection between the primary pressure regulating valve and the valve seat. A secondary pressure regulating zone is provided at the connection between the secondary pressure regulating valve and the valve seat. The valve seat contains a first channel connecting the air inlet connector and the inlet of the main shut-off valve, a second channel connecting the outlet of the main shut-off valve and the primary pressure regulating zone, and a third channel connecting the primary pressure regulating zone and the secondary pressure regulating zone. The main shut-off valve contains a pilot air channel penetrating its lower and upper ends. The valve seat contains a fourth channel connecting the upper end of the main shut-off valve and the inlet of the pilot valve, and a fifth channel connecting the outlet of the pilot valve and the second channel. An air outlet connector is installed on the secondary pressure regulating valve.

2. The two-stage pressure regulating and flow regulating device according to claim 1, characterized in that, The first-stage pressure regulating valve includes a first valve body, which has a first cavity. The first cavity is equipped with a first-stage pressure balancing piston and a first-stage pressure balancing spring. The first-stage pressure balancing piston has a first-stage pressure regulating channel. The first-stage pressure balancing piston divides the first cavity into an upper first cavity and a lower first cavity. The upper first cavity is connected to the outside atmosphere. One end of the first-stage pressure balancing piston has an air inlet that connects the first-stage pressure regulating zone and the first-stage pressure regulating channel, and the other end is connected to the lower first cavity.

3. The two-stage pressure regulating and flow regulating device according to claim 2, characterized in that, A pressure relief valve is installed in the first lower cavity.

4. The two-stage pressure regulating and flow regulating device according to claim 1, characterized in that, The secondary pressure regulating valve includes a second valve body, which has a second cavity. The second cavity has a secondary pressure balancing piston and a secondary pressure balancing spring. The secondary pressure balancing piston has a secondary pressure regulating channel. The secondary pressure balancing piston divides the second cavity into an upper second cavity and a lower second cavity. The upper second cavity is connected to the outside atmosphere. One end of the secondary pressure regulating channel is connected to the secondary pressure regulating zone, and the other end is connected to the lower second cavity. The air outlet connector is installed in the lower second cavity.

5. A two-stage pressure regulating and flow regulating device according to claim 4, characterized in that, A sealing gasket is installed in the secondary pressure regulating zone.

6. A two-stage pressure regulating and flow regulating device according to claim 1, characterized in that, A filter is installed in the first channel and a filter plug is provided.

7. A two-stage pressure regulating and flow regulating device according to claim 1, characterized in that, The valve seat has a water-heat channel.

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